You are right, the setProducerSubtopics control the messages routing no
matter that the client has collection which matches the addItemToFill's
fillparameters. I thought it was too many messages send to client if the
client didn't have the relevant fill. However, it is how it works. It is
same as the createItem. If you had a message event handler, you could
handle the message by the dst.createItem. For createItem message, the
client's dataservice didn't handle this message since there was no
ind...